diff --git a/target/linux/ath79/dts/ar7161_fortinet_fap-220-b.dts b/target/linux/ath79/dts/ar7161_fortinet_fap-220-b.dts
index 331bc31714..63fe9ade53 100644
--- a/target/linux/ath79/dts/ar7161_fortinet_fap-220-b.dts
+++ b/target/linux/ath79/dts/ar7161_fortinet_fap-220-b.dts
@@ -101,7 +101,7 @@
 		ieee80211-freq-limit = <2402000 2482000>;
 		nvmem-cells = <&macaddr_art_120c>, <&cal_art_1000>;
 		nvmem-cell-names = "mac-address", "calibration";
-		mac-address-increment = <1>;
+		mac-address-increment = <9>;
 		#gpio-cells = <2>;
 		gpio-controller;
 	};
@@ -112,7 +112,7 @@
 		ieee80211-freq-limit = <2402000 2482000 4900000 5990000>;
 		nvmem-cells = <&macaddr_art_520c>, <&cal_art_5000>;
 		nvmem-cell-names = "mac-address", "calibration";
-		mac-address-increment = <9>;
+		mac-address-increment = <2>;
 		#gpio-cells = <2>;
 		gpio-controller;
 	};